Various Info
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http://members.aol.com/mpucoder/DVD/index.html
http://dvd.sourceforge.net/

Try this:

./gst-launch dvdnavsrc location=/dev/dvd ! mpegdemux .video_%02d ! { queue ! mpeg2dec ! xvideosink } mpegdemux0.private_stream_1_0 ! { queue ! a52dec ! osssink }

You can give title, chapter, and angle parameters to dvdnavsrc.